During any fiscal quarter in which elimination of securities from the portfolio of an investment company occur, the securities remaining in the portfolio shall, for the purpose of sections 5 and 12 of the Act (54 Stat. 800, 808; 15 U.S.C. 80a-5, 80a-12), be so valued as to give effect to the eliminations in accordance with one of the following methods:
Specific certificate,
First in—first out,
Last in—first out, or
Average value.